home *** CD-ROM | disk | FTP | other *** search
- From: stephanh@ix.netcom.com (Stephan Heumann)
- Newsgroups: alt.hemp,alt.hemp.politics,talk.politics.drugs,alt.politics.democrats.d
- Subject: Re: Clue to Clinton: 85% ... Statistical remarks.
- Date: 25 May 1995 08:24:40 GMT
- Message-ID: <3q1es8$sh6@ixnews3.ix.netcom.com>
-
- gal2@kimbark.uchicago.edu (Jacob Galley) writes:
- >
- >
- >Even if the President read his mail, your survey shows nothing without
- >proper statistical analysis (and even then, very little).
- >
- >I have data here from the National Opinion Research Center's General
- >Social Survey on the legalization of marijuana by age group and
- >education level. The GSS is a multistage, stratified probability
- >sample of English speaking adults living in US households. That is,
- >the data is collected by interviewing randomly selected adults in
- >randomly selected houses on randomly selected streets in randomly
- >selected towns. The survey has been administered since 1972, and is
- >supported by NSF. The table below uses data from the 1990-94 data
- >sets.
- >
- >
- >Q: Do you think that the use of marijuana should be made legal or not?
- >
- > Percent who approve of legalization
- >
- >AGE NO BACHELOR'S (100%=) BACHELOR'S (100%=)
- >
- >18-34 25.2% (1157) 22.8% (307)
- >35-64 21.5% (1757) 26.1% (631)
- >65+ 11.2% (752) 21.4% (126)
- >
- >All 20.5% (3666) 24.6% (1064)
- >
- >
- >The numbers in parentheses show how many people were sampled in each
- >category. For the non-college-graduates, p < .000005, meaning that
- >the trend across age groups is highly significant. For the college
- >graduates, p = .3, so no significant relationship between age and
- >legalization preference exists.
- >
-
- Jake-
- Thanks for the valuable (if discouraging) statistics. I can't dispute
- these results when the survey question is posed in terms of point-blank
- legalization, with no specific, coherent policy proposed. That's why
- the familiar model of the wine laws is useful.
-
- And granted, a self-selected sample can be highly biased (or weighted
- by motivation on either side), so the fact that Parade magazine's
- phone-in poll last year (with a $1 900 number) found 76% agreement that
- "marijuana should be as legal as wine" adds no credence to my result.
-
- But at about the same time, I conducted a *phone-out* poll using random
- Palo Alto phone numbers and also came up with 76% agreement (in a
- sample of 50) that "the marijuana laws should be reformed to be no more
- restrictive than the wine laws." OK, it's a well-educated population.
-
- Still, the voters are also a self-selected, motivation-weighted sample!
-
- One academic note on "significance" of age correlation: evidently the
- p-values cited are computed for a linear model. With such large and
- unequal age cells, this seems like a highly questionable procedure. But
- the non-linearity of levels of pro-legalization sentiment with age
- among college graduates doesn't bother me, so I'll pass on questioning
- it. Except to lament the fact that recent graduates are (purportedly)
- even more anti-legalization than non-graduates in their age bracket.
-
- It _really_ makes me worry about the state of higher education today.
- It seems that lower education (e.g., DARE) has gained the upper hand.
-
- (/..\)
- -Stephan
-
-
-